1FEATURES

23• 8-Channel Complete Analog Front-End:

– LNA, VCA, PGA, LPF, and ADC

• Ultra-Low, Full-Channel Noise:

– 0.85nV/√Hz (TGC)

– 1.1nV/√Hz (CW)

• Low Power:

– 122mW/Channel (40MSPS)

– 74mW/Channel (CW Mode)

• Low-Noise Pre-Amp (LNA):

– 0.75nV/√Hz

– 20dB Fixed Gain

– 250mVPP Linear Input Range

• Variable-Gain Amplifier:

– Gain Control Range: 46dB

• PGA Gain Settings: 20dB, 25dB, 27dB, 30dB

• Low-Pass Filter:

– Selectable BW: 10MHz, 15MHz

– 2nd-Order

• Gain Error: ±0.5dB

• Channel Matching: ±0.25dB

• Distortion, HD2: –65dBFS at 5MHz

• Clamping Control

• Fast Overload Recovery: Two Clock Cycles

• 12-Bit Analog-to-Digital Converter:

– 10MSPS to 50MSPS

– 69.5dB SNR at 10MHz

– Serial LVDS Interface

• Integrated CW Switch Matrix

• 15mm × 9mm, 135-BGA Package:

– Pb-Free (RoHS-Compliant) and Green

APPLICATIONS

• Medical Imaging, Ultrasound

– Portable Systems

DESCRIPTION

The AFE5805 is a complete analog front-end device

specifically designed for ultrasound systems that

require low power and small size.

The AFE5805 consists of eight channels, including a

low-noise amplifier (LNA), voltage-controlled

attenuator (VCA), programmable gain amplifier

(PGA), low-pass filter (LPF), and a 12-bit

analog-to-digital converter (ADC) with low voltage

differential signaling (LVDS) data outputs.

The LNA gain is set for 20dB gain, and has excellent

noise and signal handling capabilities, including fast

overload recovery. VCA gain can vary over a 46dB

range with a 0V to 1.2V control voltage common to all

channels of the AFE5805.

The PGA can be programmed for gains of 20dB,

25dB, 27dB, and 30dB. The internal low-pass filter

can also be programmed to 10MHz or 15MHz.

The LVDS outputs of the ADC reduce the number of

interface lines to an ASIC or FPGA, thereby enabling the high system integration densities desired for

portable systems. The ADC can either be operated

with internal or external references. The ADC also

features a signal-to-noise ratio (SNR) enhancement

mode that can be useful at high gains.

The AFE5805 is available in a 15mm × 9mm, 135-ball BGA package that is Pb-free

(RoHS-compliant) and green. It is specified for

operation from 0°C to +70°C.